A combined experimental and model analysis on the effect of pH and O2(aq) on γ-radiolytically produced H2 and H2O2

Joseph, Jiju M.; Choi, Byung Seon; Yakabuskie, Pam; Wren, J. C.

doi:10.1016/j.radphyschem.2008.06.001

Cited by 93 publications

(136 citation statements)

References 24 publications

Supporting

Mentioning

130

Contrasting

Order By: Relevance

“…The H 2 generation G-values for neutrons was 1.7-2.3 when specimens contained a lot of water. This value is large: 2-5× larger than the value for hydrogen generation from bulk water by gamma radiation alone (G=0.45) or neutron (G=1.0) (Elliot et al 1990, Kasten 1991, Joseph et al 2008, Butarbutar et al 2014. This value can be 0.04 when there was almost no free water.…”

Section: It-a1mentioning

confidence: 82%

Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation

Maruyama

Kontani

Takizawa

et al. 2017

ACT

View full text Add to dashboard Cite

In 2008, Nuclear and Industrial Safety Agency (NISA) (currently integrated to the Nuclear Regulatory Authority) launched a project to develop a soundness assessment method for concrete members subject to a radiation environment. Presently, the soundness of concrete members subject to radiation is evaluated based on whether the predicted fast neutron fluence and gamma-ray dose values are lower than specific reference values in Japan, which are 1×10 20 n/cm 2 and 2×10 5 kGy, respectively. These reference values were determined based on report by Hilsdorf et al. This project begins by reviewing Hilsdorf et al.'s report, and we find that the scientific evidence for the current reference values is weak. We thus conclude that new experimental research is required to assess the current reference values and to propose a new alternative soundness assessment procedure if needed. We quantitatively evaluated the influence of neutrons, gammarays, and the resultant heating and drying processes on the strength of concrete as well as their underlying mechanisms. The irradiation experiments confirmed the degradation mechanism of concrete due to neutron irradiation. The main reason for this degradation is the metamictization of rock-forming minerals, which, in turn, leads to aggregate expansion. Due to aggregate expansion, cracks around aggregates form, which reduce the compressive strength and Young's modulus of concrete. Among the rock-forming minerals, α-quartz is the most sensitive to neutron radiation.60 Co gamma-ray irradiation experiments demonstrated that concrete strength increased as the gamma-ray dose and gammaray flux does not have a dose-rate impact on the first radiolysis of evaporable water in cement paste within the present study. The effect of gamma-ray irradiation on the properties of concrete is equivalent to that of heating and drying. Concrete strength alteration due to heating and drying is attributed to the colloidal and porous nature of hardened cement paste and crack formation around the aggregate due to a mismatch in the volume changes of the mortar and aggregate. In addition, a numerical analysis code called DEVICE (Damage EValuation for Irradiated ConcretE) is developed to harness knowledge obtained from concrete samples to predict the distribution of the physical properties in concrete members and their changes over time. From these fundamental studies, we propose a new soundness assessment procedure for concrete members subject to radiation. We also recommend a new radiation-induced strength-degradation reference value of 1×10 19 n/cm 2 for fast neutron.

show abstract

Section: It-a1mentioning

confidence: 82%

Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation

Maruyama

Kontani

Takizawa

et al. 2017

ACT

View full text Add to dashboard Cite

show abstract

“…Water is not reactive with organic radicals and hence its transport is not directly affected be simulated by addition of H2O2 to the water [8], as H2O2 is the corrosion rate controlling water radiolysis product [35,36]. We speculate that the formation of H2O2, or organic peroxy radicals (•RO2) formed via radiolytic decomposition of IL cations in presence of dissolved oxygen and/or water (reaction 3), may be responsible for the radiation-induced corrosion behaviour observed in this study.…”

Section: All Of the Cs Coupons Corroded In [P14666] [Br] Under -Irramentioning

confidence: 99%

Corrosion of carbon steel in the [P 14666 ][Br] ionic liquid: The effects of γ-radiation and cover gas

et al. 2016

View full text Add to dashboard Cite

“…(The increase in temperature in the metal phase induced by the energy absorption is very small, on the order of a few degrees [13].) However, bulk phase water is able to absorb energy effectively and this energy is used to break water molecules into redox active species, ranging from highly oxidizing ( • OH, H 2 O 2 , O 2 ) to highly reducing ( • e aq − , • O 2 − ) [1,[13][14][15][16][17][18][19]. The radiolytic production of these species will affect the driving force for electrochemical corrosion and the rate of corrosion [1,[20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Combined effect of gamma-radiation and pH on corrosion of Ni–Cr–Fe alloy inconel 600

Musa

Wren

2016

Corrosion Science

View full text Add to dashboard Cite

A combined experimental and model analysis on the effect of pH and O2(aq) on γ-radiolytically produced H2 and H2O2

Cited by 93 publications

References 24 publications

Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation

Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation

Corrosion of carbon steel in the [P 14666 ][Br] ionic liquid: The effects of γ-radiation and cover gas

Combined effect of gamma-radiation and pH on corrosion of Ni–Cr–Fe alloy inconel 600

Contact Info

Product

Resources

About